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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">CURLMOPT_SOCKETFUNCTION - callback informed about what to wait for <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0"><pre class="level0">
&#35;include &lt;curl/curl.h&gt;
&nbsp;
int socket_callback(CURL *easy,      /* easy handle */
&nbsp;                   curl_socket_t s, /* socket */
&nbsp;                   int what,        /* see above */
&nbsp;                   void *userp,     /* private callback pointer */
&nbsp;                   void *socketp);  /* private socket pointer */
&nbsp;
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETFUNCTION, socket_callback);
</pre>
<a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0">Pass a pointer to your callback function, which should match the prototype shown above. 
<p class="level0">When the <span Class="emphasis">curl_multi_socket_action(3)</span> function runs, it informs the application about updates in the socket (file descriptor) status by doing none, one, or multiple calls to the <span Class="bold">socket_callback</span>. The callback gets status updates with changes since the previous time the callback was called. If the given callback pointer is NULL, no callback will be called. Set the callback's <span Class="bold">userp</span> argument with <a Class="emphasis" href="./CURLMOPT_SOCKETDATA.html">CURLMOPT_SOCKETDATA</a>.  See <span Class="emphasis">curl_multi_socket_action(3)</span> for more details on how the callback is used and should work. <a name="DEFAULT"></a><h2 class="nroffsh">DEFAULT</h2>
<p class="level0">NULL (no callback) <a name="PROTOCOLS"></a><h2 class="nroffsh">PROTOCOLS</h2>
<p class="level0">All <a name="EXAMPLE"></a><h2 class="nroffsh">EXAMPLE</h2>
<p class="level0">TODO <a name="AVAILABILITY"></a><h2 class="nroffsh">AVAILABILITY</h2>
<p class="level0">Added in 7.15.4 <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0">Returns CURLM_OK. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
<p class="level0"><a Class="manpage" href="./CURLMOPT_SOCKETDATA.html">CURLMOPT_SOCKETDATA</a>, <span Class="manpage">curl_multi_socket_action (3)</span>, <a Class="manpage" href="./CURLMOPT_TIMERFUNCTION.html">CURLMOPT_TIMERFUNCTION</a>
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